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3. Mach 2 plane

Alternative clues for the word sst

• Sound-barrier breaker of yore
• European streaker
• Earlier flight hidden in the seven longest puzzle answers
• Leather sharpener
• Jet decommissioned in '03
• International airport lander
• It began commercial service in '76
• Bygone jet, briefly
• It doesn't fly anymore
• Fast jet, for short